lennox error code continous flashing LED

apparently the blower stopped coming on yesterday while running the AC on a lennox system which caused the system to freeze up it is now thawed and al condensation is gone but it still will not blow all I get when I run the test is a continuous flashing led. It says this is caused by a twinning problem or reverse polarity but the system was operating just fine the way it was wired not sure what the next step is?